Article ID: 307454 - Last Review: February 20, 2007 - Revision: 5.2 MS01-052: Invalid RDP data can cause Terminal Services failureThis article was previously published under Q307454 TECHNICAL UPDATES
On This PageSYMPTOMS
A denial of service vulnerability exists in Terminal Services in Windows 2000 and in Windows NT Server 4.0, Terminal Server Edition. An attacker may use this vulnerability to cause a Windows 2000 or a Windows NT 4.0 terminal server to fail. The server may be restarted without incident, but any work that was in progress at the time of the failure will be lost.
Mitigating factors
Terminal service client disconnected The client did not connect to the terminal server. The server may be too busy. Please try connecting later. This problem does not occur with the Windows NT Server 4.0, Terminal Services Edition update. CAUSE
This vulnerability occurs because Windows NT Server 4.0, Terminal Server Edition and Terminal Services in Windows 2000 fail when they receive a particular series of packets over a Remote Desktop Protocol (RDP) connection.
RESOLUTIONWindows 2000To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:260910
(http://support.microsoft.com/kb/260910/
)
How to obtain the latest Windows 2000 service pack
The resolution for this problem is also included in Windows 2000 Security Rollup Package 1 (SRP1).
For additional information about SRP1, click the following article number to view the article in the Microsoft Knowledge Base:
311401
(http://support.microsoft.com/kb/311401/
)
Windows 2000 Security Rollup Package 1 (SR about SRP1), January 2002
The following files are available for download from the Microsoft
Download Center:Collapse this image  Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base: 119591
(http://support.microsoft.com/kb/119591/EN-US/
)
How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. Date Time Version Size File name -------------------------------------------------------------------- 19-Oct-2001 14:40 5.0.2195.3895 125,712 Icaapi.dll 19-Oct-2001 14:42 5.0.2195.4527 107,280 Instrdp5.dll 19-Jul-2001 20:39 5.0.2195.3895 93,456 Licmgr.exe 28-Sep-2001 18:30 5.0.2195.4435 330,000 Lserver.exe 19-Oct-2001 14:40 5.0.2195.3895 26,384 Mstlsapi.dll 19-Oct-2001 14:42 5.0.2195.4527 89,080 Rdpwd.sys 128-bit 19-Oct-2001 14:42 5.0.2195.4527 89,048 Rdpwd.sys 56-bit 18-Oct-2001 21:22 5.0.2195.4527 100,248 Rdpwsx.dll 19-Jul-2001 20:39 5.0.2195.3895 141,584 Termsrv.exe 19-Oct-2001 14:40 5.0.2195.3895 23,312 Tls236.dll Windows NT Server 4.0, Terminal Server EditionThe following file is available for download from the Microsoft Download Center:Collapse this image For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base: 119591
(http://support.microsoft.com/kb/119591/
)
How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. Date Time Version Size File name -------------------------------------------------------------- 14-Apr-2004 10:08 4.0.1381.33564 70,928 Icaapi.dll 14-Apr-2004 10:10 4.0.1381.33564 91,608 Rdpwd.sys 15-Feb-2002 21:27 4.0.1381.33528 41,880 Rdpwsx.dll The English version of the original security update (Q307454i.exe) was released on October 19, 2001. The original update has the file attributes that are listed in the following table. Date Time Version Size File name --------------------------------------------------------- 31-Jul-2001 11:22 4.0.1381.33478 61,712 Icaapi.dll 08-Oct-2001 16:16 4.0.1381.33478 91,512 Rdpwd.sys 08-Oct-2001 16:36 4.0.1381.33478 41,880 Rdpwsx.dll STATUSWindows 2000Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 3.Windows NT Server 4.0, Terminal Server EditionMicrosoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Windows NT Server 4.0, Terminal Server Edition.MORE INFORMATION
For more information about this vulnerability, visit the following Microsoft Web site:
http://www.microsoft.com/technet/security/bulletin/MS01-052.mspx
(http://www.microsoft.com/technet/security/bulletin/MS01-052.mspx)
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:
265173
(http://support.microsoft.com/kb/265173/
)
The Datacenter Program and Windows 2000 Datacenter Server product
For additional information about how to install multiple hotfixes with only one reboot, click the following article number to view the article in the Microsoft Knowledge Base:
296861
(http://support.microsoft.com/kb/296861/
)
How to install multiple Windows updates or hotfixes with only one reboot
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